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lisa5250
17.12.2019 •
Mathematics
Afast food restaurant executive wishes to know how many fast food meals teenagers eat each week. they want to construct a 85% confidence interval for the mean and are assuming that the population standard deviation for the number of fast food meals consumed each week is 1.4 . the study found that for a sample of 502 teenagers the mean number of fast food meals consumed per week is 3.1 . construct the desired confidence interval. round your answers to one decimal place. lower end point and upper end point
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Ответ:
The 85% confidence interval for the mean number of fast food meals each week is (3.01 meals, 3.19 meals).
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so ![z = 1.44](/tpl/images/0421/5594/2c2ce.png)
Now, find M as such
In which
is the standard deviation of the population and n is the length of the sample. So
The lower end of the interval is the mean subtracted by M. So it is 3.1 - 0.09 = 3.01 meals.
The upper end of the interval is the mean added to M. So it is 3.1 + 0.09 = 3.19 meals.
The 85% confidence interval for the mean number of fast food meals each week is (3.01 meals, 3.19 meals).
Ответ:
Explanation: If one Canadian dollar bill is $1.00 and a Trinidad’s $1.00 is $2.73 then that means if you wanna convert it you have to double the amount including the €73 and you have 2,500 you need to double the amount then add the remaining €73.